js/src/tests/test262/built-ins/Array/prototype/reduce/15.4.4.21-5-6.js


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// Copyright (c) 2012 Ecma International.  All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
esid: sec-array.prototype.reduce
description: >
    Array.prototype.reduce throws TypeError if 'length' is 0
    (subclassed Array, length overridden with obj with valueOf), no
    initVal
---*/

foo.prototype = new Array(1, 2, 3);

function foo() {}
var f = new foo();

var o = {
  valueOf: function() {
    return 0;
  }
};
f.length = o;

function cb() {}
assert.throws(TypeError, function() {
  f.reduce(cb);
});

reportCompare(0, 0);